package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 根据shoppingCart对象查询购物车表
     * @param shoppingCart
     * @return
     */
    @Override
    public List<ShoppingCart> list(ShoppingCart shoppingCart){
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 添加购物车
     * @param shoppingCartDTO
     * @return
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO){
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //购物车不为空
        if (list != null && list.size() == 1) {
            shoppingCart = list.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.update(shoppingCart);
        }else{   //当前购物车不为空，但不存在该商品
            Long dishId = shoppingCartDTO.getDishId();
            //是套餐还是菜品
            if(dishId != null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());

            }else{
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 删除购物车商品
     * @param shoppingCartDTO
     * @return
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO){
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        shoppingCart = list.get(0);
        shoppingCart.setNumber(shoppingCart.getNumber() - 1);
        if (shoppingCart.getNumber() <= 0) {
            shoppingCartMapper.delete(shoppingCart);
        }else {
            shoppingCartMapper.update(shoppingCart);
        }

    }

    /**
     * 清空购物车
     * @return
     */
    @Override
    public void clean(Long userId){
        shoppingCartMapper.deleteByUserId(userId);
    }

}
